[BUGFIX] Preserve selection ranges in RteLinkBrowser

When the RteLinkBrowser is opened, any active ranges are now backed up
and reused later when an element gets linked. This fixes clashes with
the browser's internal search feature that overrides the `Selection`
object.

Resolves: #90952
Releases: master, 9.5
Change-Id: I155157e808370cd5ff05076a6c82f09da3b0cb3c
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/63985
Tested-by: Josef Glatz <josefglatz@gmail.com>
Tested-by: TYPO3com <noreply@typo3.com>
Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Josef Glatz <josefglatz@gmail.com>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>

typo3/sysext/rte_ckeditor/Resources/Public/JavaScript/RteLinkBrowser.js

@@ -20,12 +20,13 @@ define(['jquery', 'TYPO3/CMS/Recordlist/LinkBrowser', 'TYPO3/CMS/Backend/Modal']
 
   /**
    *
-   * @type {{plugin: null, CKEditor: null, siteUrl: string}}
+   * @type {{plugin: null, CKEditor: null, ranges: null, siteUrl: string}}
    * @exports TYPO3/CMS/RteCkeditor/RteLinkBrowser
    */
   var RteLinkBrowser = {
     plugin: null,
     CKEditor: null,
+    ranges: null,
     siteUrl: ''
   };
 
@@ -51,6 +52,9 @@ define(['jquery', 'TYPO3/CMS/Recordlist/LinkBrowser', 'TYPO3/CMS/Backend/Modal']
       });
     }
 
+    // Backup all ranges that are active when the Link Browser is requested
+    RteLinkBrowser.ranges = RteLinkBrowser.CKEditor.getSelection().getRanges();
+
     // siteUrl etc are added as data attributes to the body tag
     $.extend(RteLinkBrowser, $('body').data());
 
@@ -116,6 +120,7 @@ define(['jquery', 'TYPO3/CMS/Recordlist/LinkBrowser', 'TYPO3/CMS/Backend/Modal']
     linkElement.setAttribute('href', link);
 
     var selection = RteLinkBrowser.CKEditor.getSelection();
+    selection.selectRanges(RteLinkBrowser.ranges);
     if (selection && selection.getSelectedText() === '') {
       selection.selectElement(selection.getStartElement());
     }